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Provisions and other liabilities - Disclosure of other provisions (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
Balance - Beginning of period $ 45,967 $ 30,654
Acquisition of the San Antonio gold project 0 9,301
New liabilities 34,011 6,570
Revision of estimates (1,457) (310)
Accretion 1,192 820
Settlement/payments of liabilities (7,822) (1,655)
Issuance of flow-through shares 7,885 0
Recognition of deferred premium on flow-through shares (6,971) 0
Currency translation adjustments (292) 587
Balance - End of period 72,513 45,967
Current portion 12,179 4,431
Non-current portion 60,334 41,536
Provisions and other liabilities 72,513 45,967
Environmental Rehabilitation [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 34,601 20,527
Acquisition of the San Antonio gold project 0 9,301
New liabilities 20,433 4,176
Revision of estimates (1,457) (310)
Accretion 1,192 820
Settlement/payments of liabilities (1,240) (500)
Issuance of flow-through shares 0 0
Recognition of deferred premium on flow-through shares 0 0
Currency translation adjustments (292) 587
Balance - End of period 53,237 34,601
Current portion 2,287 3,019
Non-current portion 50,950 31,582
Provisions and other liabilities 53,237 34,601
Lease liabilities [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 11,366 10,127
Acquisition of the San Antonio gold project 0 0
New liabilities 13,578 2,394
Revision of estimates 0 0
Accretion 0 0
Settlement/payments of liabilities (6,582) (1,155)
Issuance of flow-through shares 0 0
Recognition of deferred premium on flow-through shares 0 0
Currency translation adjustments 0 0
Balance - End of period 18,362 11,366
Current portion 8,978 1,412
Non-current portion 9,384 9,954
Provisions and other liabilities 18,362 11,366
Deferred premium on flow-through shares [Member]    
Disclosure of other provisions [line items]    
Balance - Beginning of period 0  
Acquisition of the San Antonio gold project 0  
New liabilities 0  
Revision of estimates 0  
Accretion 0  
Settlement/payments of liabilities 0  
Issuance of flow-through shares 7,885  
Recognition of deferred premium on flow-through shares (6,971)  
Currency translation adjustments 0  
Balance - End of period 914 $ 0
Current portion 914  
Non-current portion 0  
Provisions and other liabilities $ 914